Projection apparatus



Febr',y 1940. H. MuLcH 2,188,954

PROJECTION APPARATUS Filed Oct. 27, 1937 ATTORNEY .Patented Feb. 6, 1940 PATENT OFFICE PRQJECTION APPARATUS um Mulan, Wetzlar-Niedergang. Germany, assignor to Ernst Leitz, G.m. b. H., Wetllar,

Germany Application 3 Claims.

, This invention relates to picture projection apparatus and its object is to providea small inexpensive apparatus for projecting purposes.

The invention is embodied in an apparatus conl structed and arranged as hereinafter set forth and which includes certain novel features relating tothe support and mounting of the condenser lens elements which in turn serve to support the picture slide frame and the 'objective carrier. l0 'I'hese latter elements are rotatably carried by the condenser housing.

In the accompanying drawing `illustrating the invention- Fig.' 1 is a view of the projection apparatus Il partly broken away and in section to show the arrangement of the condenser elements, the slide frame and the objective,

Fig. 2 is a top view also partly and partly in section. n Ihe reference numeral I denotes the-general broken away housing of the projection apparatus which rests upon a supporting base, not shown. The housing supports an electric lamp 2 by any usual means not particularly indicated. 'I'he front wall 3 has an aperture I through which the condenser unit, picture frame and objective are mounted and operated. v

The condenser unit includes the lenses I which are held in proper optically spaced relation in a 3i) mounting t. The latter may be secured to the housing L by screws 'l which pass into supporting lugs The picture frame i hasthe usualslit. Il for inserting the picture slides. 'I'he frame is rotatably and slidably carried by the condenser mounting I by means of a tubular extension Il. The latter has four Ventilating openings i2 adapted to register with two VentilatingA openings I3 in the condenser mounting t so that when the outer n picture frame tube Il is rotated ninety degrees denser unit is located withinl the housing which makes for compactness. That the picture frame landobjectives uerotatalilyandslidablycarried october 21, 1931, serian. mass Germany December 4, 1933 by the condenser unit for proper display and focusing purposes and that no additional elements, such as is found in prior structures for such purposes. are required in the present inven-l tion. j

The projection apparatus disclosed embodiesv the utmost simplicity and compactness and ma be manufactured at low costs.

Iclaim: A

-1. A projection apparatus of the character described comprising a housing, a lamp in said. housing, a condenser lens unit. a mounting in which said unit is supported, means for securing the said mounting to the said housing with the greater portion of the mounting within the housing, a picture frame support, an objective secured to the front portlon'thereof, a tubular rear extension on said support enclosing and slidably and rotatably mounted upon said condenser lens unit mounting for rotatably positioning said picture frame support in one of two predetermined picture projecting positions ninety degrees apart, means for maintaining said support in either one cf said projecting positions, the greater portion of the saidmounting and tubular extension being contained within the housing to provide a compact small projection apparatus.

2. A projection apparatus of the character described comprising a housing having a projec- `tion aperture in the iront wall thereof, a lamp in said housing, a condenser lens unit,a mounting in which said unit is supported. fastening lugs in the housing spaced a substantial distance from the said front-wall, means for securing the said mounting to the said lugs, a. picture frame support, an objective secured thereto in front of said support, a rear tubular extension on said.-

` support enclosing the said mounting and directly rotatably and slidably carried thereby for rotatably positioning said picture frame support in 40 one of two predetermined picture projecting positions ninety degrees apart, means for maintaining said support in either one of said projecting positions,vthe greater portion of said condenser lens unit and picture frame support being within said housing behind the front wall thereof, said picture frame support and objective being immediately in front of said front wall.

3. A projection apparatus according to claim 2 including ventilating openings in the condenser si)y l menorca, 

